# BH1750FVI H-Resolution mode test

import smbus
import time

bus = smbus.SMBus(1)
addr = 0x23

def MTreg_set(h_value, l_value):
    bus.write_byte(addr, h_value)
    bus.write_byte(addr, l_value)
    time.sleep(0.5)
    
def sensor_read():
    luxRead = bus.read_i2c_block_data(addr, 0x10)
#    lx = int((luxRead[0]*256 + luxRead[1]) / 1.2)
    lx = int(((luxRead[0] << 8) | luxRead[1]) / 1.2)
    print('Illuminance: ' + str(lx) + ' lux')
    time.sleep(0.5)

print('<H-Resolution mode>' + '\n')
bus.write_byte(addr, 0x10)
time.sleep(1)     # important setting (MIN=0.6)
# defoult MTreg=69
MTreg_set(0x42, 0x65)

# first read
print('<first>')
sensor_read()
    
# reset
print('\n' + '<reset>' + '\n')
bus.write_byte(addr, 0x7)
    
# second read
print('<second>')
sensor_read()
    
# third read
print('<third>')
sensor_read()